FFmpeg README
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1) Documentation
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* Read the documentation in the doc/ directory.

2) Licensing
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* Read the file COPYING.LGPL. FFmpeg and the associated libraries EXCEPT
  for libpostproc and libswscale are licensed under the GNU Lesser General
  Public License.

* libpostproc and libswscale are distributed under the GNU General Public
  License, see the file COPYING.GPL for details. Their compilation and use
  in FFmpeg is optional.

* The files libavcodec/x86/idct_mmx.c, libavcodec/x86/h264_deblock_sse2.asm
  and libavcodec/x86/h264_idct_sse2.asm are distributed under the GNU General
  Public License. They are strictly optimizations and their use is optional.

* The file libavcodec/ac3dec.c is distributed under the GNU General Public
  License.  In order for (E-)AC-3 decoding to work you need to enable GPL
  components.

* The file libavdevice/x11grab.c is distributed under the GNU General
  Public License. X11 grabbing is optional.

* The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c
  are taken from libjpeg, see the top of the files for licensing details.

* The file libavcodec/fdctref.c is copyrighted by the MPEG Software Simulation
  Group with all rights reserved. It is only used to create a DCT test program
  and not compiled into libavcodec.

* Some external libraries are under GPL. If you wish to use them with FFmpeg,
  you have to configure FFmpeg as GPL as well.